Abstract

PURPOSE:To align the optical axes of optical fibers with each other for a long period and to surely connect them by forming a slit in a tube material obtained by holding a material for a spring by noncutting machining to its overall length. CONSTITUTION:The slit 22 is formed in the raw material 21 obtained by cutting the long-sized tube material 20 to specific length to constitute a sleeve, and the plug ferrules 6 of the optical fibers 1 are fitted onto both ends of the sleeve. The raw material 21 is formed by holding the spring material by noncutting machining, so a decrease in clamping force due to fatigue and deformation is not caused even when the plug ferrules are attached and detached repeatedly and the optical fibers have no axial deviation, bending, and the machining is easily and the productivity is improved.